A quadratic pseudospectrum framework finds approximate joint eigenvectors of the Hamiltonian and translation operators to produce unfolded band structures in aperiodic and finite systems.
Unfolding spinor wave functions and expectation values of general operators: Introducing the unfolding-density operator,
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Band Unfolding via the Quadratic Pseudospectrum
A quadratic pseudospectrum framework finds approximate joint eigenvectors of the Hamiltonian and translation operators to produce unfolded band structures in aperiodic and finite systems.